The effects
Guitar effects online, one at a time
Each of the 15 pedals has a page: what it does to the signal, the graph it is built from, what each knob changes, what the offline test measured, and the pedal itself to play on its own.
The effects
All 15, in the order the board’s default puts them.
Tuner
Reads the pitch of the note at its place in the chain.
2 knobs · standard nodesNoise gate
Shuts the signal off when it falls below a threshold.
2 knobs · AudioWorkletOctave
Adds the octave above by rectifying, the octave below by dividing.
3 knobs · AudioWorkletWah
A resonant band-pass filter moved by a knob or by how hard you play.
3 knobs · standard nodes + AudioWorkletCompressor
Turns loud passages down so that quiet and loud sit closer together.
5 knobs · AudioWorkletOverdrive
Soft, symmetrical clipping: a tanh curve, oversampled, then a tone filter.
3 knobs · standard nodesFuzz
Hard, lopsided clipping: the wave is pushed off-centre, then cut at two different heights.
3 knobs · standard nodesEQ
Three bands: a low shelf, a movable mid peak, a high shelf.
4 knobs · standard nodesPhaser
Four all-pass stages mixed with the dry signal: two notches that sweep.
4 knobs · AudioWorkletChorus
A copy delayed by about 18 ms whose delay drifts, mixed with the original.
3 knobs · standard nodesFlanger
A very short moving delay mixed with the dry signal: a comb of notches that sweeps.
4 knobs · AudioWorkletTremolo
Turns the volume down and up again at a steady rate.
3 knobs · standard nodesDelay
Repeats what you played after a set time, each repeat quieter and darker.
4 knobs · standard nodesReverb
Convolution with an impulse response that the page generates.
4 knobs · standard nodesCabinet
A filter curve shaped like a guitar speaker. An approximation.
3 knobs · standard nodesMethod
How each page is built.
How to read an effect’s page
Every page has the same parts. First the pedal itself, alone between an input and an output, so that what you hear is that effect and nothing else. Then what it does to the signal, in words. Then its graph, drawn: solid lines are audio, dashed lines are control signals, which move a setting and are never heard themselves. Then a table of its knobs with their ranges in real units. Then what was measured when the effect was rendered offline with a known signal, and whether the measurement matched the description. Then its limits.
Two kinds of pedal
9 of the 15 are built entirely from the standard nodes every browser’s Web Audio engine provides: filters, delays, gains, a wave shaper, a convolver. 5 run as AudioWorklet processors, which are small programs the page supplies that handle the signal one sample at a time. The wah is both: a standard filter, moved by an envelope follower that is an AudioWorklet processor. They are written that way where standard nodes cannot do the job: a loop of standard nodes must contain a delay of at least 128 samples, which rules out a flanger’s feedback and a phaser’s, and a gate or a compressor needs a detector with separate attack and release times.
All 15 pedals have 50 knobs between them. None is modelled on a product.
Computed, measured, sourced
Nothing on these pages is fetched: every sound is computed in your browser, and the one request the board’s scripts make is for their own AudioWorklet module. Every effect was rendered offline and measured, and 73 of 73 checks came out as described; the sentences on each page are the test’s own output. Nothing was tested on real hardware, in more than one browser, or by ear.
Each page’s general definition is the English Wikipedia article on the effect at a named revision, read 2026-09-28. The conventional order is GuitarPlayer’s guide to pedal order, quoted briefly. Every source, and what stays in your browser, is on the about page. To see how the pedals fit together, go to the signal chain page, or put them on the board.